Running great one day and next it stalls every time I hit the gas too hard

Bl1zzard said

I can't set the fuel pressure on a mechanical pump, but I really don't think it has anything to do with fuel pressure. Remember it only stalls when I wack the gas. If I go easy on it, and slowly press it to the floor the secondary's open up and away she goes. If there was any kind of fuel starvation problem it would happen all the way up the revs not just from the wack on the pedal.
I'll look for the fuel dribbling out of the boosters. Maybe all my fun on Saturday knocked some crap loose somewhere and jammed up a needle, but you would think that would bugger up the idle too.
I'm gonna focus on the pump shot, though I'm not sure it would stall. Wouldn't it just bog if there was no extra fuel squirted? It almost seems like it's dumping too much fuel and stalling it.

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I went through it all again tonight. Warmed it up and checked timing (14 degrees at idle), vacuum (14inches at idle), looked for fuel dribbling (none), accelerator pump shot (nice clean spray of fuel), no vacuum leaks, no shorts that I could see. No hesitation or stalling when I was hitting the gas in park so I decided to bump up the timing a little to 18 degrees (plugs were slightly black @ 14 degrees) and took it for a spin. Now it didn't stall when I whacked the gas, just a small stumble.

So do you think I'm on to something with the timing or should I keep focus on the carburetor? I did notice a little dried gas right around the base plate to the body of the carb. Maybe it's time for a rebuild. After all my cousin probably ran it for 10 years, then it sat for another 15 until I got it from him. I just plunked it on and set it up. I don't think it's ever been rebuilt.